The equation appears to be a counterexample to a famous mathematical
statement, Fermat’s Last Theorem. Pierre de Fermat had proposed the
theorem in 1637, and a proof had only recently been discovered when
the episode aired. Cohen wrote a computer program to find
near-misses for Fermat’s Last Theorem, equations that were close
enough to being true that a person who tapped it into a calculator
would be fooled.